What is an exhaust donut?

[Stratous]

I know where it is...but what is it's purpose?

[jory]

to seal the exhaust manifold to the downpipe and provide some room for flex so it doesnt break.

[Runner]

And make sure you change it once the glazing and sprinkles wear off.

[Timmay2]

All pictures respectively owned by TU.

This is the turbo outlet / swingvalve.


[IMG]http://********************/shop/images/TU%203%20inch%20Swingvalve%20and%20mounting%20bolt s.jpg[/IMG]
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The dish is where the exhaust donut sits.
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This is the exhaust donut.
[IMG]http://********************/shop/images/2.5%20inch%20donut.jpg[/IMG]
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Notice its shaped dish-like to match the swingvalve surface. This allows it to twist up/down/side to side and still make a good seal.
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This is the downpipe, which has the flat lip near the end that pushes the donut into the dish.
[IMG]http://********************/shop/images/3%20inch%20Aluminized%20Downpipe.jpg[/IMG]

[Timmay2]

Let me know when youre good on the explanation so i can take down the links so not to waste bandwith on tu.

[mpgmike]

The exhaust doughnut is more commonly referred to as the muffler bearing.

Mike
www.PowreHaus.com

[slasky]

and this is the donut for the TU 3" swingvalve

[86Tona]

Quote:

Originally Posted by mpgmike The exhaust doughnut is more commonly referred to as the muffler bearing. Mike www.PowreHaus.com

I thought it was the knuter valve.

Does anyone know where to get only the flange for a downpipe? Short of making one I guess a bone yard would work too. But what about new?

[rib256]

TU sells a 2.5" flange. Does anyone know where to get a 3" flange??

[86Tona]

Thanks I'll check it out.

[Stratous]

Thanks, you can drop the links now...

Another question...If I were to get a 3" swingvalve back exhaust, with a new donut...Would the 3" exhaust donut fit the stock swingvalve?

[tryingbe]

Quote:

Originally Posted by rib256 TU sells a 2.5" flange. Does anyone know where to get a 3" flange??

Use a grinder to bore out the 2.5in to 3inch.